Machine-tool.



C. A. PARSONS A. Q. CARNEQIE & S. S. CO0K. MACHINE TOOL. I,

M m APPLICATION FILED (EB. 23, I9I5- Patented July 24,1917.

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MACH lNE TOOL. APPLICATION FILED FEB. 23, 1915.

Patented July 24, 1917.

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CHARLES ALGERNON PARSONS AND ALFRED QUINTIN CARNEGIE, F NEWCAST'L'FL UPON-TYNE, AND STANLEY SMITH COOK, 0F WALLSENID, ENGLAND; SAID GARNEGI 1''] AND SAID COOK ASSIGNORS TO SAID PARSONS.

MACHINE-TOOL.

application filed February 23, 1915.

To all whom it may concern: 1

Be it known that we, The Honorable Sir CHARLES ALGERNON PARSONS, K. C. B., of Heaton Works, Newcastle-on-Tyne, in the county, of Northumberland, England, AL- FRED QUINTIN CARNEGIE, of Heaton Works, Newcastle-on-Tyne, in the county of Northumberland, England, and STANLEY SMITH COOK, of Turbinia Works. rVallsend-on- Tyne, in the county of Northumberland, England, have invented certain new and useful Improvements in and Relating to Ma chine-Tools, of which the following is a. specification.

The present invention relates broadly to machine tools such as for example gear cutting and like machines of the type in which, two juxtaposed members are adapted to ro-" tate in contact in the same direction about a common axis, one of the members which acts as an indexing or dividing member being driven from a source of power, while the second member carrying the work is retated by gearing from the first member and at a different rate therefrom.

The present invention relates more particularlyito machines of this class, such as are described in connection with Figures 1 to 3, in the specification of British Letters Patent No. 29,380 of 1912. It has been found by'experiments with gear cutting machines involving the use of superposed members one of which carries the work, that if both members rotate in the same direction and consequently with small relative motion between their contacting surfaces, then on any attempt being made to transmit considerable pressure across those contacting surfaces, irregular jerky inotion of the work carrying memher results due to the lubrication being imperfect owing to the small relative motion between the surfaces, the friction being probably on the border line between metallic and viscous friction.

I The object of the present invention is to overcome the above difficulties and to provide an improved construction of tool of the type indicated. r

The present invention consists in a ma.- chine tool of the type indicated in which the secondary member carrying the work is Supportedby contact with stationary surfaces. The present invention further consists in Specification of Letters Patent.

Patented July 24L, 1191?.

Serial No. 10,103.

ed to be rotated by gearing from the primary member, but at a different rate therefrom.

The present invention further consists in tllGlIllPIOYOtl machine tools hereinafter de-' scribed.

Fig. l is a part cross-sectional elevation. showing the present invention applied to a cutting machine.

Fig. 2 is a part sectional plan of Fig. 1.

Fig. 3 is a part cross-seetional elevation showii'ig the present invention applied to a modified form of gear cutting machine.

Fig. c is a part sectional plan of Fig. 3.

In carrying this ilfvention into elfect according to one form and as applied to a gear cutting machine (see Figs. 1 and 2) there is provided a. horizontal bed a preferably of box girder formation and having a. suitably hushed vertical bearing, 6, therein.

The work carrying table 0 hereinafter called the secondary member provided with a stem d to fit the hushed hole in the bed plate, while the'priinary member takes the form of a ring element e constrained to rotate concentric with the axis of the second-- ary member by a suitable projection or boss 7" upon the bed. The primary member 6 carries the driven member {1 of the parent or indexing gear.

Surrounding the primary member a statical spindle secured to the primary member e, the spur wheel is engaging a station? ary pinion m coaxial with the primary member and secured to the above mentioned boss f upon the bed.

The bevel pinion Z meshes with a bevel wheel a upon a shaft 0 carrying a worm p and supported in bearings Q upon the primary member the worm being adapted to ei'igage with and drive a worm wheel 9 secured upon the secondary member.

The effect of this train is that upon the primary member being rotated by the parent gear the spur wheel upon the vertical spindie is rotated and consequently the bevel pinion thus driving the worm p engaging the worm wheel 7 upon the secondary member the whole being so arranged that the SGCOl ltldl'y member 0 rotates in the same direction as but at a rate different from that of the primary member 6.

Figs. 3 and 4 show the application of the stationary frame to a machine in which the primaryand secondary members and the intermediate gearing are similar to the first described form with the difierence that instead of the pinion on being secured toa stationary boss it is secured to a ring-like member s carrying worm wheel teeth 25 and adapted to be driven by a worm u.

The efi'ec't of this construction is that whereas in the first form with a given train of gear wheels, the rate of movement of the secondary member 0 with respect to the pri mary member e depended upon the rate at which the vertical spindle on, the primary member moved around the stationary pinion m, in this modification (Figs. 3 and 4) by imparting a backward motion to the ring 8 carrying the pinion m, the ratio between the speeds of the secondary and primary members 0 and 6 may be increased.

It will be understood that the driving member of the parent 1; is carried upon a sha t w which may convenien tly have bearings 02 in the frame 71,, andi'which is driven from the same shafting as the tooth forming device y for instance, the hob when such is employed. In the last described form the worm u which rotates the pinion m in the backward direction may also be driven from the same shaft as the driving member "a: of the parent gear.

It will be seen that the constructions indicated provide a very satisfactory arrangement of parts and the use of the frame memv her it allows the gearing to be well protected from chips of metal and dirt, while suitable hand holes allow for access where required.

At Figs. 4 and 5 of the before mentioned Letters Patent, a construction is illustrated in which the difliculty as to low rubbing speed of the secomlary table upon its support does not occur as the secondary table ear, z. 6., the wormis in that construction adapted to bear directly upon the bed of the machine while ble toothed ring rotates around the secondary member.

In such a construction however, it is necessary to mount the phase changing gears upon the secondary member and although the position of the point of contact of the final drive shifts in relation to the cutter, it has a constant regular position in relation to the work, a disadvantage which is avoided when the phase changing train is supported on a primary table, as in the constructions hereinbefore described.

Having now described our invention what we claim as new and desire to secure by Letters Patent is-:-

1. In a machine tool in combination, a driven indexing member, a work carrying member eo-axial with said meml er, gear means for rotating said work carr mg member from the first member at a di erent rate from the rate of rotation of said driven member, said gear means bein carried on said driven member and a stat ionary surface adapted to support said work carrying member as set forth.

2. In a machine tool in combination, adriven indexing member, a work carrying member, means carried upon said driven member for rotating said Work carrying member. from the first member at a different rate from the rate of rotation of said driven member and a stationary frame surrounding said driven member and said gearing and having stationary surfaces supporting said work carrying member, as set forth.

3. In a gear cutting machine in combina tion, a driven indexing member, a work carrying member, gear means upon said driven member for rotating said Work carryin member from said driven memberat a di erent rate from the rate of rotation of said driven member and a stationary surface adapted to support said work carrying mem: her, as set forth.

4. In a gear cutting machine in combination, a bed, a bearin in said bed, primary indexing member adapted to rotat about a vertical axis and concentric with said bearing, a stationary frame surrounding said primary member, a secondary work carrying member co-axial with said primary member, said secondary member being'sup ..ported by said frame, a stem' upon said secondary member engaging said bearing and gearing carried upon said primary member and connecting said primary and-secondary members and ary member from said primary member at a different rate therefrom,as set forth.

5. In a machine tool in combination, a Work table, a bed, a stem upon said table,

a bearing in said bed co-acting with said adapted to drive said second-.

the pr mary member in the form of a doustem, a WO1111 wheel attached to said table, a ring member. constrained to rotate coaxially with said table, indexing teeth upon said ring, driving means engaging said teeth, a circular rack positioned between said table and said ring member and co-axially with said table, a stud upon said ring member, the axis of said stud being parallel to the axis of rotation of said ring member, a member adapted to rotate upon said stud and having teeth engaging said circular rack, bevel teeth upon said member, a spindle, bearings upon said ring member to support said spindle, a bevel Wheel upon said spindle in engagement with said bevel teeth, a Worm upon said spindle in engagement with said worm wheel and a ring-like frame attached to said bed surrounding said ring member and supporting said table.

6. In combination in a machine tool, abed, a Work carrying table const'ained to rotate about a vertical axis in said bed a l u frame secured to sald bed and lying between said bed and said table, a bearing surface upon the upper side of sa1d frame, a hearing surface u pen the under side of said table co--acting with said last mentioned surface to support said table, an indexing member co-axial with said table and within said frame, driving means for said indexing member, a gear train carried by said index-v said table, an indexing member co-axial with said table and within said frame, driving means for said indexing member, a gear train carried by said indexing member, said trainacting to rotate said table from said indexing member and at a different rate therefrom. v

In testimony whereof, \ve affix our signatures in presence of two witnesses.

CHARLES ALGERNON PARSONS. ALFRED QUINTIN CARNEGIE. STANLEY SMITH COOK.

Witnesses:

FREDERICK GouuoN HAY Bunroiu), ALmurr lVlLLiAM PARK. 

